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We report a case of anal canal cancer in a 65-year-old woman who had complained of bloody stool. Physical examination revealed a 2.5 cm ulcerated tumor in the anterior wall of the anal canal astride the dentate line. Histological examination of biopsy specimens confirmed the diagnosis of moderately differentiated squamous cell carcinoma. Chemoradiation therapy included whole pelvic irradiation amounting to 4140 cGy followed by conformal boost irradiation of 2000 cGy and 5-fluorouracil div 750 mg/24 hr 3 days, mitomycin C iv 10 mg day 1, and cisplatinum div 50 mg day 2. Six weeks later the tumor had completely regressed, and there was no evidence of recurrence 21 months later. Her anorectal function was retained.

We present a patient with renal artery stenoses due to fibromuscular dysplasia involving the point of arterial bifurcation that we could successfully dilate with percutaneous transluminal angioplasty. We used the kissing balloon technique to prevent possible complications of percutaneous transluminal renal angioplasty (PTRA), including occlusion of the other branch while dilating one branch. The kissing balloon technique worked well for PTRA of the arterial bifurcation.

Gelatin sponge particles were rendered radiopaque by soaking them in small amounts of iodized oil (LP-GS). They were evaluated for their usefulness in transarterial embolization (TAE). The LP-GS particles were well visualized fluoroscopically during TAE. The duration of the opacity of LP-GS exceeded 24 hours both in vitro and in vivo. LP-GS are useful, and are an easily obtainable, radiopaque, embolic material.

Wilms' tumor is an uncommon disease in adults. Wilms' tumor typically presents as a large complex mass with cystic component and varying degrees of vascularity. The previously reported radiologic findings have reflected this complex appearance. We present a case of cystic Wilms' tumor in an adult patient. The tumor presented as a large, rapidly growing, hypovascular, multicystic mass with minimal solid component which showed as septation on ultrasound, contrast enhanced CT, and MR studies. The preoperative findings were suggestive of multilocular cystic nephroma. We suggest that Wilms' tumor should be included in the differential diagnosis of a patient who presents with a large, rapidly growing, multicystic renal mass.

Purpose: The purpose of this study was to evaluate the effects of selected parameters in a conventional spin-echo MRI sequence on image quality in a phantom undergoing periodic motion., Methods: Images of a composite oil/copper sulfate phantom moving in a 1.5 Tesla magnet were acquired. The CuSO4 ghost signal-to-noise ratio (SNR) and distances between corresponding points on the phantom image and adjacent ghosts were evaluated., Results: Increasing time to repeat (TR) and number of acquisitions (NAq) improved image quality. Ghost SNR was near unity at TR = 500 msec and at NAq around 4. Increasing TR and NAq resulted in increased distance between images. The effects of field of view (FOV) and matrix size on image quality were relatively less significant., Conclusion: Increasing NAq appeared to have a comparatively greater effect on ghost SNR and image quality under our experimental conditions. However, the effect of increasing NAq on image quality appeared to be definite since a saturation point was reached after a particular NAq. Increasing NAq above this point resulted in a relatively smaller improvement in image quality.

We report a case of a pituitary prolactinoma mimicking a sphenoid sinus or clival tumor. On magnetic resonance (MR) images, a soft tissue mass located inferior to the apparently normal pituitary gland, and occupied the posterior third of the sphenoid sinus and eroded the upper portion of the clivus. It had iso- to low intensity on the T1-weighted image, and slightly high intensity on the T2-weighted image. Careful observation revealed that the floor of the sella turcica was not identified and there was sulcus formation between the tumor and clivus, probably suggesting extraclival tumor, pituitary tumor. Transsphenoidal tumor resection and histopathological study revealed that it was a prolactinoma.

We report for the first time the metastasis of intracranial hemangiopericytoma to the heart. In evaluating cardiac conditions, MRI provided useful information regarding the location and features of paracardiac tumors.

This is a report of a patient with hepatocellular carcinoma whose hepatic arterial catheter, which was introduced via a subclavian arterial branch, migrated into his right gastric artery. The catheter was successfully maneuvered to a suitable position without any further invasive procedure. The importance of preparatory embolization of the right gastric artery is underscored.

A case of pancreatic metastasis from thyroid cancer resected seven years previously is presented. Pancreatic metastases of thyroid cancer are rare. The radiological features of the tumor are described and the diagnostic implications of pancreatic metastases are discussed.